16579820816 has 20 divisors (see below), whose sum is σ = 34594434252. Its totient is φ = 7652224896.

The previous prime is 16579820797. The next prime is 16579820827. The reversal of 16579820816 is 61802897561.

It can be written as a sum of positive squares in 2 ways, for example, as 789385216 + 15790435600 = 28096^2 + 125660^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39855131 + ... + 39855546.

Almost surely, 2^16579820816 is an apocalyptic number.

16579820816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16579820816 is an abundant number, since it is smaller than the sum of its proper divisors (18014613436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16579820816 is a wasteful number, since it uses less digits than its factorization.

16579820816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79710698 (or 79710692 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 16579820816 in words is "sixteen billion, five hundred seventy-nine million, eight hundred twenty thousand, eight hundred sixteen".